Source code for satpy.tests.reader_tests.test_vii_l2_nc

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (c) 2020 Satpy developers
# satpy is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# satpy is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with satpy.  If not, see <>.

"""The vii_2_nc reader tests package."""

import datetime
import os
import unittest
import uuid

import dask.array as da
import numpy as np
import xarray as xr
from netCDF4 import Dataset

from satpy.readers.vii_l2_nc import ViiL2NCFileHandler


[docs] class TestViiL2NCFileHandler(unittest.TestCase): """Test the ViiL2NCFileHandler reader."""
[docs] def setUp(self): """Set up the test.""" # Easiest way to test the reader is to create a test netCDF file on the fly # uses a UUID to avoid permission conflicts during execution of tests in parallel self.test_file_name = TEST_FILE + str(uuid.uuid1()) + ".nc" with Dataset(self.test_file_name, 'w') as nc: # Create data group g1 = nc.createGroup('data') # Add dimensions to data group g1.createDimension('num_pixels', 100) g1.createDimension('num_lines', 10) # Create measurement_data group g1_2 = g1.createGroup('measurement_data') # Add variables to data/measurement_data group delta_lat = g1_2.createVariable('delta_lat', np.float32, dimensions=('num_lines', 'num_pixels')) delta_lat[:] = 0.1 self.reader = ViiL2NCFileHandler( filename=self.test_file_name, filename_info={ 'creation_time': datetime.datetime(year=2017, month=9, day=22, hour=22, minute=40, second=10), 'sensing_start_time': datetime.datetime(year=2017, month=9, day=20, hour=12, minute=30, second=30), 'sensing_end_time': datetime.datetime(year=2017, month=9, day=20, hour=18, minute=30, second=50) }, filetype_info={} )
[docs] def tearDown(self): """Remove the previously created test file.""" # Catch Windows PermissionError for removing the created test file. try: os.remove(self.test_file_name) except OSError: pass
[docs] def test_functions(self): """Test the functions.""" # Checks that the _perform_orthorectification function is correctly executed variable = xr.DataArray( dims=('num_lines', 'num_pixels'), name='test_name', attrs={ 'key_1': 'value_1', 'key_2': 'value_2' }, data=da.from_array(np.ones((10, 100))) ) orthorect_variable = self.reader._perform_orthorectification(variable, 'data/measurement_data/delta_lat') expected_values = 1.1 * np.ones((10, 100)) self.assertTrue(np.allclose(orthorect_variable.values, expected_values)) self.assertEqual(orthorect_variable.attrs['key_1'], 'value_1')